<PackageReference Include="NUnit" Version="3.0.0" />

Path

public static class Path
Some path based methods that we need even in the Portable framework which does not have the System.IO.Path class
public static readonly char AltDirectorySeparatorChar

Alternate directory separator

public static readonly char VolumeSeparatorChar

A volume separator character.

public static readonly char WindowsSeparatorChar

Windows directory separator

public static string GetFileName(string path)

Get the file name and extension of the specified path string.